CARLO GAVAZZI WM5-96 - PROGRAMMING Instruction Manual page 32

Programming WM5 96
30
Programming examples of the analog
outputs
Power retransmission by means of a 0-20mA analog output.
It's necessary to measure a consumed power up to 100kW and
retransmit this value by means of a signal from 4 to 20 mA: the mod-
ule to be used is AO2050 (2x from 0 to 20mA), the instrument is to be
programmed as follows:
VARIABLE: W∑ (system active power).
MIN OUT: 20.0% means 4 mA the calculation to be carried out is the fol-
lowing: (100*minimum output) / fullscale output =100*4mA/ 20mA=20%.
MAX OUT: 100.0% means 20mA, the calculation to be carried out is:
(100*maximum output) / fullscale output = 100*20mA/20mA= 100.
MIN IN: 0,0k; the multiple k,M,G can be selected on the instrument
according to the chosen VT and CT values.
MAX IN: 100.0k; the k, M, G multiples can be selected on the instru-
ment according to the selected VT and CT values.
Transmission of active consumed and generated power by means
of -5/+5mA analog output.
It's necessary to measure both the consumed active power up to
100kW and the generated active power up to -100kW and retransmit
this value by means of a signal from -5 to +5mA: the module to be
used is AO2052 (2x from -5/+5mA), the instrument is to be pro-
grammed as follows:
VARIABLE: W∑ (system active power).
MIN OUT: -100% means -5mA, the calculation to be carried out is:
(100*minimum output)/ fullscale output= 100*5mA/-5mA=-100%.
MAX OUT: 100,0% means 20mA, the calculation to be carried out is:
(100*max output)/ fullscale output= 100*5mA/5mA= +100%.
MIN IN: -100,0k; the multiples k,M and G can be selected on the
instrument on the basis of the VT and CT values.
MAX IN: 100,0k; the multiples K, M and G can be selected on the
instrument depending on the VT and CT values being selected.
Retransmission of the POWER FACTOR (PF) by means of the
0-20mA analog output.
It's necessary to retransmit the whole range of the admitted values for
the PF with a signal from 0 to 20mA. Particular attention must be paid
to the value of the PF variable which may vary from C0,001 and L0,000
(for each phase): these values will be retransmitted and will then cor-
respond to 0 and 20 mA. When the PF will have a value equal to 1,
being in the middle between C0,001 and L0,000, the value of the out-
put will correspond to the middle of the scale, that is 10mA. As a con-
sequence, the instrument will have to be programmed as follows:
VARIABLE: PF L1 (or L2 or L3 or PF∑).
MIN OUT: 0,0%.
MAX OUT: 100,0%.
MIN IN: C0,001 (the C symbol shows a CAPACITIVE value).
MAX IN: L0,001 (the L symbol shows an INDUCTIVE value). L0,001
has been chosen as minimum value to be set in order to avoid any
undesirable swifting of the repeated outputs.
WM5-96 Instruction Manual